Microstructural features and electrical properties of copper oxide added potassium sodium niobate ceramics
Ceramics International, cilt.36, sa.6, ss.1921-1927, 2010 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 36 Sayı: 6
- Basım Tarihi: 2010
- Doi Numarası: 10.1016/j.ceramint.2010.03.018
- Dergi Adı: Ceramics International
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.1921-1927
- Anahtar Kelimeler: (K,Na)NbO3, A. Powders: solid state reaction, B. Microstructure-final, C. Ferroelectric properties
- Maltepe Üniversitesi Adresli: Evet
Özet
In this study, effects of 0.5, 1.0 and 1.5 mole% CuO addition on the properties of potassium sodium niobate (K0.5Na0.5)NbO3-KNN ceramics were investigated. Pure KNN and CuO-added KNN pellet samples were sintered at 1100 and 1090 °C for 4 h, respectively. Phase analysis showed that all samples crystallized in pure orthorhombic perovskite phase. Addition of 1.0 and 1.5 mole% CuO caused grain growth, densification and formation of a liquid phase at the grain boundaries. Curie temperature has shifted from 480 to 435 °C with increasing CuO ratio. The most remarkable characteristic of the hysteresis loops were the constricted nature of the 0.5 mole% CuO-added KNN's curve and the antiferroelectric-like appearance of the 1.5 mole% CuO-added KNN's curve. Piezeoelectric properties of d33 = 120 pC/N, kp = 0.27 and Qm = 772 were obtained from the 1.5 mole% CuO-added KNN. © 2010 Elsevier Ltd and Techna Group S.r.l.